Our guides explain the ideas behind the tools in plain language, with examples you can actually follow. Use them when you want to understand the answer rather than simply get one.
How we approach these guides: they are written to help with the actual task in front of you. We use examples, point out common mistakes and explain where a simple calculator has limits. If you spot an error or something that needs clarification, please let us know through the Contact page.
Percentages, age, pricing and break-even planning.
QR codes, barcodes, Base64 and file transfers.
Invoices, margins, pricing and practical workflows.
Simple wording and practical details that can make an invoice easier for a customer to understand and easier for a business to follow up.
Read the guide →A practical explanation of what the break-even number can tell you about costs, pricing and sales targets—and what it cannot tell you.
Read the guide →Why there is no single “good” margin and how to think about margin in the context of costs, industry and pricing.
Read the guide →A practical approach to invoice numbers that keeps records easy to find, reconcile and explain.
Read the guide →Understand break-even sales, fixed costs, variable costs and target profit with a simple worked example.
Read the guide →Margin and markup are related but not interchangeable. Here is how to calculate each one and why the difference matters in pricing.
Read the guide →A practical checklist for preparing a clear invoice that a client can understand and a business can file.
Read the guide →Simple, realistic ways a small business can use QR codes to connect printed material with useful online information.
Read the guide →